Surface-reflected seismic energy from underground explosions, in the form of a pP phase and a spall-closure (slapdown) phase, Ps, may contribute to the P wave and coda seen at teleseismic distances. In this report, delay times corresponding to pPP and PsP are estimated from surface-zero accelerograms for a number of U.S. underground nuclear explosions and are presented for use by the seismological community. When compared with published estimates, these pPP estimates are in reasonable agreement but the PsP estimates are at wide variance. No ready explanation is at hand for the disagreement.

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